package com.itheima.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.common.BaseContext;
import com.itheima.common.CustomException;
import com.itheima.entity.*;
import com.itheima.mapper.OrderMapper;
import com.itheima.service.*;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

@Service
@Slf4j
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Orders> implements OrderService {
    @Autowired
    private ShoppingCartService cartService;
    @Autowired
    private UserService userService;
    @Autowired
    private AddressBookService addressBookService;
    @Autowired
    private OrderDetailService orderDetailService;

    /**
     * 用户下单
     * 操作多个数据库，事务控制
     * @param orders
     */
    @Override
    @Transactional
    public void submit(Orders orders) {
        //获得当前用户的ID
        Long currentId = BaseContext.getCurrentId();

        //查询当前用户的购物车数据
        LambdaQueryWrapper<ShoppingCart> lqw=new LambdaQueryWrapper<>();
        lqw.eq(ShoppingCart::getUserId,currentId);
        List<ShoppingCart> list = cartService.list(lqw);
        //购物车为空则不必下单
        if (list==null || list.size()==0){
            throw new CustomException("购物车为空，不能下单");
        }

        //查询用户数据
        User user = userService.getById(currentId);

        //查询地址数据
        AddressBook addressBook = addressBookService.getById(orders.getAddressBookId());
        if (addressBook==null){
            throw new CustomException("用户地址信息有误，不能下单");
        }

        //向订单表插入数据，一条数据

        //调用MP功能自动生成订单号（number）
        //因为两张要同id才不自动生成  自动生成两张表怎么同个id
        long orderId = IdWorker.getId();

        //遍历购物车,以及将数据封装成订单明细集合
        //创建对象
        //AtomicInteger 是原子多线程int基本数据类型 操作中不会出现多线程赋值失败错误,因为其原子性所以这里很关键
        AtomicInteger amount = new AtomicInteger();

        List<OrderDetail> orderDetails= list.stream().map((item)->{
            OrderDetail orderDetail = new OrderDetail();
            //前边的自动生成订单号就是为了这里设置的时候可以和order表一样
            orderDetail.setOrderId(orderId);
            orderDetail.setNumber(item.getNumber());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setAmount(item.getAmount());//单份金额
            //累加:单份金额乘以份数，然后封装成BigDecimal类型，再转成int整型
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;
        }).collect(Collectors.toList());
        orders.setId(orderId);
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
       // bigdecimal是为了防止浮点数计算出现错误
        //需要遍历购物车数据，计算总金额
        orders.setAmount(new BigDecimal(amount.get()));
        orders.setStatus(2);// 1待付款，2待派送，3已派送，4已完成，5已取消
        orders.setUserId(currentId);
        orders.setNumber(String.valueOf(orderId));//订单号
        orders.setUserName(addressBook.getConsignee());
        orders.setConsignee(addressBook.getConsignee());
        orders.setPhone(addressBook.getPhone());
        orders.setAddress((addressBook.getProvinceName() == null ? "":addressBook.getProvinceName())
                + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
                + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
                + (addressBook.getDetail() == null ? "" : addressBook.getDetail()));
        this.save(orders);

        //向订单明细表插入数据，多条数据
        orderDetailService.saveBatch(orderDetails);
        //清空购物车
        cartService.remove(lqw);
    }
}
